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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
Lead is also a common additive to certain types of glass. Visible light is nearly completely permeable to clear glass, and a flat pane of glass does not affect its properties. Quartz crystal is permeable to visible light but polarizes it. The faces of the crystal through which it passes affect this polarization. Quartz crystal also has a useful application, called piezoelectricity, that glass does not. Piezoelectricity is the generation of electrical potential through mechanical stresses, and the opposite is also true. This relationship is used to vibrate quartz to keep precise time in watches and computer clocks.